The 2017 Broadway revival of “Miss Saigon” raises rich and deep enduring questions. Based on Giacomo Puccini’s “Madame Butterfly,” the mammoth musical has enjoyed decades of success – as has Claude-Michel Schönberg and Alain Boublil’s “Les Miserables.” Success aside, the questions remain: What is the “ultimate sacrifice” one human being can make for another? What are the moral parameters involved…